Valve Adjustments - Control Block Manifold - Genie GTH-636 Service Manual

June 2007
REV C
7-22
Valve Adjustments -
Control Block Manifold
How to Set the Steer System
Pressure
Note: Be sure that the hydraulic oil level is visible
in the inspection glass of the hydraulic tank.
1 Install a 0 to 3500 psi / 0 to 250 bar pressure
gauge into test port 2 at the side of the
hydraulic tank.
Note: There are four test ports at the hydraulic
tank. Test port 1 is closest to the tank; test port 4 is
farthest from the tank.
GTH-1048
GTH-1056
a test port
b test port 4
c test port 3
d test port 1
a b c d
Part No. 97487 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
GTH-636
GTH-644
GTH-842
GTH-844
6
b c d
Section 4 • Repair Procedures
2 Start the engine. Allow the engine to idle after
warming the engine to operating temperature.
3 Without operating any machine controls,
observe the reading on the pressure gauge.
Result: The pressure gauge reads
2250 psi / 155 bar. The pressure setting is
correct.
Result: The pressure gauge fails to read
2250 psi / 155 bar. The pressure setting needs
to be adjusted. Continue to step 4.
4 Locate the boom lift/extend relief valve
(schematic item FC) of the control block on the
front of the hydraulic tank. Loosen the jam nut
at the top of the valve. Turn the adjustment
screw clockwise to increase the pressure or
counterclockwise to decrease the pressure.
Tighten the jam nut and repeat this procedure
beginning with step 3.
a
FA
FB
FC
b
c
a hydraulic tank
b boom lift/extend relief valve
c control block manifold
MANIFOLDS
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